It's the Thursday before Mother's Day, which makes it the last day you can comfortably order flowers for your mom without freaking out that they won't arrive in time. But if you forget, or are simply too cheap to spring for an Edible Arrangement, Facebook is offering a digital flower in some markets. The flower was spotted by Twitter user Sreedev Sharma. "To celebrate Mother's Day, we are testing the ability for people in a few markets to leave a flower reaction," the company said in a...